JP2002369416A - Yoke structure of thin-type fan motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a yoke structure of an inner rotor-type thin and low noise fan motor, on which a coil can be mounted simply without requiring even a special coil winding machine. SOLUTION: An upper yoke 1 is formed with two upper brim parts 1b toward the center from a ring-shaped external peripheral part 1a. A lower yoke 3 is formed with two support parts 3b, directed toward the lower from the internal peripheral end of a ring-shaped external peripheral part 3a, is further formed with lower brim parts 3c toward the center from the respective support parts 3b. A coil-receiving part is formed by the support part 3b and the lower brim part 3c. After a coil 2 is mounted in the coil-receiving part, by superposing the upper yoke 1 on the lower yoke 3 so as to alternately arrange the upper/ lower brims, a stator is constituted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a yoke structure of an inner rotor type thin fan motor.

[0002]

2. Description of the Related Art FIG. 8 shows an example of a yoke structure of a conventional inner rotor type fan motor. Yoke 25
Has a ring-shaped portion 25a and four coil winding portions 25b projecting inward from the ring-shaped portion 25.
A coil 26 is wound around each coil winding part. A rotor 29 having a magnet 28 attached to a shaft 28 is disposed at the center of the yoke 25. Ring-shaped portion 25a of yoke 25, coil winding portion 25b, N of magnet
A magnetic circuit is formed between the pole and the S pole, and the rotor 29 rotates.

[0003]

The yoke of the conventional inner rotor type motor has a coil winding portion 25b.
Is formed to extend from the inner peripheral end of the outer peripheral ring portion 25a to the center, and is configured to wind the coil in the axial direction. Therefore, winding the coil around the yoke is not easy and requires a special winding machine. In addition, since the coil is wound around the yoke, an insulation process must be performed between the coil and the winding portion of the yoke.
Further, when the polarity of the motor is changed, a new winding machine that winds in accordance with the polarity must be made.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a thin and low-noise inner rotor type fan which can easily mount a coil and does not require a special coil winding machine. An object of the present invention is to provide a yoke structure for a motor.

[0005]

In order to achieve the above object, a yoke structure of a thin fan motor according to the present invention has a coil mounted on an outer peripheral frame having a brim portion, and a permanent magnet in a central portion of the yoke. In the yoke structure of the thin fan motor of the type in which the attached rotor is arranged, an upper yoke having an upper collar portion formed from the inner peripheral end of the outer ring portion toward the center and a lower portion from the inner peripheral end of the outer ring portion And a lower yoke that can accommodate a coil by forming a lower collar portion from the lower end of the support portion toward the center of the outer peripheral ring portion. After accommodating the coil so that it is perpendicular to the axis, the outer ring portion of the upper yoke and the outer ring portion of the lower yoke are overlapped so that the upper flange portion and the lower flange portion are alternately arranged. Stay A magnetic circuit is formed between the N and S poles of the permanent magnet of the rotor disposed at the center of the stator, the collar of the upper yoke, the outer ring, and the collar of the lower yoke. It is configured to be. The present invention also provides a thin fan motor yoke structure in which a coil is mounted on an outer peripheral frame having a brim portion, and a rotor having a permanent magnet attached thereto is disposed at a central portion of the yoke. An upper brim portion is formed from the inner end of the portion toward the center portion, and a support portion is formed so that the cross section becomes linear from the inner end to a lower portion of the outer peripheral portion at a position staggered from the upper brim portion. Then, a lower collar portion is formed from the lower end of the support portion toward the center of the outer peripheral portion to form an integral structure, and the coil can be inserted in a direction such that the winding surface is perpendicular to the axis from the side surface of the yoke. It is configured. Further, according to the present invention, in a yoke structure of a thin fan motor in which a coil is mounted on an outer peripheral frame having a brim portion and a rotor having a permanent magnet attached thereto is disposed at a central portion of the yoke, An upper brim portion is formed from the end toward the center portion, a support portion is formed downward from an inner circumferential end of the outer circumferential ring portion at a position staggered from the upper brim portion, and an outer peripheral ring is formed from a lower end of the support portion. The yoke formed with the lower collar portion toward the center of the portion is divided into two parts, and a coil is housed between the upper collar portion and the lower collar portion of the yoke.
It is configured to connect the divided yokes.

[0006]

According to the above construction, since the coil is not wound around the yoke, the insulating structure between the yoke and the coil is simplified. Also, the work of mounting the coil on the yoke is facilitated. Furthermore, a coil can be made using a normal winding machine separately from the yoke.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an exploded perspective view showing an embodiment of a yoke structure of a thin fan motor according to the present invention. On the inner peripheral end surface of the outer ring portion 1a of the upper yoke 1, two upper brim portions 1b facing each other with the central portion therebetween are formed. On the other hand, two arc-shaped support parts 3b are formed downward at the lower end of the inner peripheral part of the outer ring part 3a of the lower yoke 3, and the lower flange part 3c facing each other with the center part sandwiched at the respective tip parts. Is formed. Support part 3 of lower yoke 3
The coil accommodating portion is formed by b and the lower brim portion 3c. The coil 2 can be manufactured by an ordinary winding machine.

FIG. 2 is an assembled sectional view of the yoke and the coil of FIG. The stator is formed by inserting the coil 2 into the coil accommodating portion, and overlapping the outer ring portions 1a, 3a without gap so that the upper flange portion 1b and the lower flange portion 3b are staggered, and the upper flange portion 1b of the upper yoke 1 is formed. The lower flange 3b of the lower yoke 3 is excited to have different polarities from each other as shown in FIG.

FIGS. 3A and 3B are views in which a rotor is incorporated in the center of FIG. 2, wherein FIG. 3A is a sectional view and FIG. 3B is a plan view. Axis 7
The magnet 6 in which the N pole and the S pole are alternately arranged is fixed. The shaft 7 is rotatably mounted on the bearing 5, and a ring 8 for preventing the shaft 7 from coming off is fitted to a lower portion of the shaft 7, and the end of the ring 8 abuts on the receiving portion 9. The magnetic circuit includes an N pole of the magnet 6, a gap, an upper flange portion 1b of the upper yoke, an outer ring portion 1a of the upper yoke, an outer ring portion 3a of the lower yoke 3,
Lower flange 3b of lower yoke, clearance and S of magnet 6
It is formed in the pole path.

FIG. 4 is a view showing a second embodiment of the present invention, and shows a structure for reducing a leakage magnetic flux. When the gap between the upper yoke 14 and the lower yoke 15 is small, the leakage magnetic flux between the upper and lower collars increases, so that the distance between the collars of the yoke is increased. Upper collar 1 extending to the center from the inner peripheral end surface of outer ring 14a of upper yoke 14
The leakage magnetic flux is reduced by increasing the distance between the side end 14c of the lower yoke 15 and the side end 15e of the lower brim portion 15c extending from the lower end of the support portion 15b of the lower yoke 15 to the center.

FIG. 5 is a view showing a third embodiment of the present invention, and shows a structure in which a coil can be inserted from a side portion. The yoke 16 has an upper yoke and a lower yoke integrally formed, and the coil 17 can be inserted in the direction of the arrow. The outer peripheral portion of the yoke 16 includes two arc-shaped outer peripheral frames 16a facing each other and two linear outer peripheral frames 16c adjacent to each other adjacent to the outer peripheral frame 16a. An upper collar 16b extends from the arc-shaped outer peripheral frame 16a toward the center. The support 16d extends downward from the inner end of the linear outer frame 16c, and the lower flange 16e extends from the support 16d toward the center.

The cross section of the support 16d is straight. Therefore, the upper brim 16b, the support 16d, and the lower brim 1
The size of the coil insertion opening on the side of the coil housing portion constituted by 6e and the center portion are the same, and a coil 17 having an outer diameter substantially the same as the size of the upper flange can be inserted from the coil insertion opening.

FIG. 6 is a view showing a fourth embodiment of the present invention, and shows a structure in which a yoke is divided into right and left. The coil 20 can be accommodated by dividing the yoke into a left yoke 18 and a right yoke 19. Coupling projections 18a, 19a and coupling grooves 18b, 19b are provided on the joining surfaces, respectively. Coupling projection 18a accommodating coil 20
Can be integrated with the coupling groove 19b by fitting the coupling protrusion 19a into the coupling groove 18b. By dividing the yoke, the coil can be mounted even if the number of poles is four or more. The yokes can be of the same shape, and only one type of yoke press die is required.

FIG. 7 is a view showing a fifth embodiment of the present invention, and shows an octupole structure. Upper and lower brim portions 22b and 22 serving as two N poles and two S poles are provided on the divided yoke 22.
c is formed. The other divided yoke (not shown) has the same configuration, and an integral yoke can be formed by fitting the coupling projection 22d and the coupling groove 22e of the divided yoke 22 to the local divided yoke.

[0015]

As described above, according to the present invention,
The coil can be circular, and the winding is simplified, eliminating the need for a special winding machine. In addition, the winding time was shortened, and work efficiency was improved. Furthermore, since the winding to the yoke is not required, the number of motor poles can be easily adjusted. That is, regardless of the number of poles of the motor, the coils can be handled by the same shape and the same winding machine, and the productivity can be improved. In addition, it is possible to reduce noise by using the inner rotor type.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a yoke structure of a thin fan motor according to the present invention.

FIG. 2 is an assembled sectional view of a yoke and a coil of FIG. 1;

FIG. 3 is a diagram in which an inner rotor is incorporated in FIG. 2;
Is a sectional view, and (b) is a plan view.

FIG. 4 is a view showing a second embodiment of the present invention, and shows a structure for reducing leakage magnetic flux.

FIG. 5 is a view showing a third embodiment of the present invention, showing a structure in which a coil can be inserted from a side part.

FIG. 6 is a view showing a fourth embodiment of the present invention, and shows a structure in which a yoke is divided into right and left.

FIG. 7 is a view showing a sixth embodiment of the present invention, and shows an 8-pole structure.

FIG. 8 is a diagram showing an example of a conventional yoke structure.

[Explanation of symbols]

 1,14 Upper yoke 2,17,26 Coil 3 Lower yoke 4 Magnetic flux direction 5 Bearing 6,27 Magnet 16,25 Yoke 18,22 Left yoke 19 Right yoke 28 axis

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[Procedure amendment]

[Submission date] August 22, 2001 (2001.8.2
2)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 1

[Correction method] Change

[Correction contents]

Claims (3)

[Claims] 1. A yoke structure of a thin fan motor in which a coil is mounted on an outer peripheral frame having a brim portion and a rotor having a permanent magnet is mounted at a central portion of the yoke. An upper yoke having an upper flange portion formed from the end toward the center; and a support portion formed from the inner peripheral end of the outer ring portion to the lower portion. From the lower end of the support portion toward the center of the outer ring portion. A lower yoke capable of accommodating a coil by forming a lower brim portion, after accommodating the coil in the lower yoke such that a winding surface is in a direction perpendicular to an axis, and an outer peripheral ring portion of the upper yoke; A stator is formed by superposing the outer ring portion of the lower yoke such that the upper flange portion and the lower flange portion are alternately arranged, and the N pole and the S pole of the permanent magnet of the rotor disposed in the center portion of the stator are formed. very, Flange of the serial on the yoke, the outer ring portion and yoke structure of the thin fan motor, characterized by being configured to earthed circuit between the flange portion of the lower yoke is formed. 2. A yoke structure of a thin fan motor in which a coil is mounted on an outer peripheral frame having a brim portion and a rotor having a permanent magnet is disposed at a central portion of the yoke, wherein the yoke has an outer peripheral portion. An upper brim portion is formed from the inner end toward the center portion of the outer peripheral portion, and a supporting portion is formed so that a cross section becomes linear from the inner end to a lower portion at a position which is alternated with the upper brim portion of the outer peripheral portion. A lower flange portion is formed from a lower end of the support portion toward a center portion of an outer peripheral portion to form an integral structure, and a coil can be inserted in a direction such that a winding surface is perpendicular to an axis from a side surface of the yoke. The yoke structure of a thin fan motor characterized by the following. 3. A yoke structure for a thin fan motor in which a coil is mounted on an outer peripheral frame having a brim portion and a rotor having a permanent magnet is mounted at a central portion of the yoke. An upper flange portion is formed from the end toward the center portion, a support portion is formed downward from an inner peripheral end at a position which is alternated with the upper flange portion of the outer peripheral ring portion, and an outer peripheral ring is formed from a lower end of the support portion. A yoke formed by forming a lower brim portion toward the center of the portion, wherein a yoke is housed between the upper brim portion and the lower brim portion of the yoke and the two split yokes are joined. Yoke structure of a thin fan motor characterized by the following.